Fucking day 14

day14/main.go

@@ -0,0 +1,100 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	fmt.Println(part1(readData("example.txt"), 11, 7), 12)
+	fmt.Println(part1(readData("data.txt"), 101, 103))
+	part2(readData("data.txt"), 101, 103)
+}
+
+type Bot struct {
+	x, y   int
+	dx, dy int
+}
+
+func part1(bots []Bot, w, h int) int {
+	q1, q2, q3, q4 := 0, 0, 0, 0
+	hw := w / 2
+	hh := h / 2
+
+	for _, b := range bots {
+		x := ((b.x+b.dx*100)%w + w) % w
+		y := ((b.y+b.dy*100)%h + h) % h
+
+		if x > hw {
+			if y < hh {
+				q2++
+			} else if y > hh {
+				q4++
+			}
+		} else if x < hw {
+			if y < hh {
+				q1++
+			} else if y > hh {
+				q3++
+			}
+		}
+	}
+
+	return q1 * q2 * q3 * q4
+}
+
+func part2(bots []Bot, w, h int) {
+	fp, err := os.Create("output.txt")
+	if err != nil {
+		panic(err)
+	}
+
+	buffer := make([]byte, (w+1)*h)
+	for y := range h {
+		buffer[y*(w+1)+w] = '\n'
+	}
+
+	for i := range 10000 {
+		for y := range h {
+			for x := range w {
+				buffer[y*(w+1)+x] = ' '
+			}
+		}
+
+		for _, b := range bots {
+			x := ((b.x+b.dx*i)%w + w) % w
+			y := ((b.y+b.dy*i)%h + h) % h
+			buffer[y*(w+1)+x] = 'X'
+		}
+
+		// So fucking stupid
+		if strings.Index(string(buffer), "XXXXXXXX") >= 0 {
+			fmt.Println(i)
+			fmt.Fprintln(fp, i)
+			fp.Write(buffer)
+		}
+	}
+}
+
+func parsePair(s string) (x, y int) {
+	nums := strings.Split(s[2:], ",")
+	x, _ = strconv.Atoi(nums[0])
+	y, _ = strconv.Atoi(nums[1])
+	return
+}
+
+func readData(fileName string) (bots []Bot) {
+	fp, _ := os.Open(fileName)
+	scanner := bufio.NewScanner(fp)
+
+	for scanner.Scan() {
+		line := strings.Split(strings.TrimSpace(scanner.Text()), " ")
+		x, y := parsePair(line[0])
+		dx, dy := parsePair(line[1])
+		bots = append(bots, Bot{x, y, dx, dy})
+	}
+	return
+}